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//0xb8 bytes (sizeof)
struct _OPLOCK_ACK_TIMEOUT
{
    struct _KTIMER Timer;                                                   //0x0
    struct _KDPC Dpc;                                                       //0x40
    struct _WORK_QUEUE_ITEM WorkItem;                                       //0x80
    struct _NONOPAQUE_OPLOCK* Oplock;                                       //0xa0
    struct _FILE_OBJECT* OplockRequestFileObject;                           //0xa8
    ULONG OplockOwnerIntegrityLevel;                                        //0xb0
    UCHAR TimerSet;                                                         //0xb4
    UCHAR AckDone;                                                          //0xb5
};